package dao;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    //准备好用的字段
    private static String URL="jdbc:mysql://127.0.0.1:3306/blog?characterEncoding=utf-8&useSSL=false";
    private static String username="root";
    private static String password="";
    private static volatile DataSource dataSource=null;
    public static DataSource getDataSource(){
        if (dataSource==null) {
            synchronized (DBUtil.class) {
                if(dataSource==null){
                    dataSource=new MysqlDataSource();
                    //设置路径，用户名，密码
                    ((MysqlDataSource)dataSource).setURL(URL);
                    ((MysqlDataSource)dataSource).setUser(username);
                    ((MysqlDataSource)dataSource).setPassword(password);
                }
            }
        }
        return dataSource;
    }
    public static Connection connection() throws SQLException {
        return getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement!=null){
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
